Showing papers on "Decoupling (electronics) published in 1985"

Multimicroprocessor-Based Control System for Quick Response Induction Motor Drive

Abstract: Two types of vector control induction motor are discussed. One is the conventional vector control with high gain current feedback loop, the other is the decoupling control based on the voltage model of an induction motor with no current feedback. Several comparison tests show the superiorities of the decoupling control. The multimicroprocessor-based hardware configuration is presented.

Decoupling Control of Secondary Flux and Secondary Current in Induction Motor Drive with Controlled Voltage Source and Its Comparison with Volts/Hertz Control

Abstract: A concept of decoupling control in the strategy of the speed regulation of the squirrel cage induction motor with controlled voltage source is represented. The decoupling control intends to cancel out the cross terms between the secondary flux and the secondary current. Three necessary and sufficient conditions for the decoupling control are offered that correspond to taking into account the effect of the primary impedance in the control strategy. Phase lead compensation with the slip frequency control allows the realization of the decoupling control, which is found to be an extension of both the conventional vector control and the constant volts/hertz control. Numerical and experimental results are also shown.

Flat decoupling capacitor and method of manufacture thereof

Abstract: A flat decoupling capacitor having incorporated therein a multilayer chip capacitor which provides high capacitance values, local charge storage and noise decoupling for integrated circuits is presented. The decoupling capacitor essentially comprises at least two conductors electrically connected to a multilayer ceramic capacitor chip, all of which are encapsulated by an insulating material. Several embodiments are described having variations in chip dimensions, number of multilayer capacitors, number of conductors and particular structural configuration. A simplified embodiment and method of manufacture thereof is also presented.

ECL terminator comprised of a plural resistor network

Abstract: A circuit/packaging arrangement for terminating and decoupling emitter coupled logic comprises a plurality of terminating impedance components (resistors) and decoupling capacitor one end of each of which is connected via a common conductor to one pair of a multi-pin single-in-line package (SIP). The other ends of the terminating impedance and the capacitor are connected to respective terminal pins adjacent to the one pin of the SIP. The decoupling capacitor that is coupled with the terminating resistors is located, both physically and electrically, at the middle of the distribution or terminating resistors contained within the SIP, such that the resistors are distributed effectively/symmetrically on either side of the capacitor. This location of the capacitor effectively in the middle of the terminating network minimizes line inductance of the common (-2v) conductor to which one end of each of the resistors is connected.

A Multivariable Generalized Self-Tuning Controller with Decoupling Design

Abstract: This paper describes a new multivariable generalized self-tuning controller which combines the classical control strategy of pole assignment with the optimal strategy of self-tuning control. The proposed controller adopts the techniques of updating weighting polynomial matrices of the cost function on line and eliminating the tracking errors without using an integrator and realizes the decoupling self-tuning control of the multivariable system. The advantages of the controller are demonstrated by several simulation examples.

On linear dynamic state feedback decoupling

Abstract: In this paper the dynamic state feedback decoupling is solved. The transfer matrix approach turns out to be relevant for this purpose. Roughly speaking the dynamic state feedback decoupling is solvable if the number of inputs is large enough to compensate the intrinsic "non decouplability" of the system. Some new decoupling invariants are introduced. These invariants are usefull for characterizing the minimal Mac Millan degree achievable for the decoupled system.

Triangular decoupling for a binary distillation column under pressure control

Abstract: The possibility of attaining complete decoupling of a distillation column under pressure control is studied using the state space model. It is shown that under the situation where the distillation column is under pressure control by the manipulation of the condenser duty, the complete decoupling using constant state feedback may not be attained, while the triangular decoupling can be attained with eight measurement variables.

On the design of optimal decoupled two-degree-of-freedom multivariable feedback control systems

Abstract: An important consideration in the design of many control systems is decoupling (each command input controlling only one output). The two-degree-of-freedom structure is ideally suited to this task since it permits one to separate the problem of decoupling from the problem of realizing a desirable stability margin. A decoupling constraint, however, can lead to some deterioration in achievable system performance. A design procedure which minimizes this performance deterioration is outlined here.

Decoupler design and control system tuning by INA for distillation composition control

Abstract: Six distillation column models have been used in studies of the usefulness of the Inverse Nyquist Array (INA) method for design of dual composition control for distillation. Five of the column models are experimental, one describing an industrial column, the others four pilot plants. One column model is obtained by modeling from first principles. The control strategies investigated and compared are multiloop SISO, 2-way decoupling and l-way decoupling. The control variables are the standard ones, i.e. reflux flow and boilup. In most of the cases INA has been found to be a useful tool for design of the loops and for comparison of the different control approaches. INA has also been found to be useful for simultaneous tuning of the decouplers and the feedback controllers. For 2-way decoupling the criterion to minimize interaction at the critical frequency for each primary feedback loop has been found useful in most, but not all, cases. The scheme can be designed by pure gains in the decouplers and there is n...

Integrated SQUID linear amplifier design and simulation

Abstract: A linear cascade video amplifier capable of working from DC to about one GHz was designed, fabricated, and initially tested. Two asymmetric SQUIDs operating in push-pull are used to achieve linearity and to eliminate output offset. Decoupling of the Josephson oscilliation between the SQUIDs is accomplished by using a special low-pass resonant transformer. Simulation results are presented for three-and ten-junction SQUIDs.

Disturbance decoupling in decentralized linear systems by non-dynamic feedback of state or measurement†

Abstract: In this work the disturbance decoupling problem in decentralized linear systems (DDPD) is formulated and solved without making any assumption on the kind of decentralized pattern of information in the system. Necessary and sufficient conditions are given under which disturbance decoupling is possible by applying local control laws formed by a combination of measured disturbance feedforward and non-dynamic feedback of state or measurement. For the solution of DDPD, the new geometric concepts of k — (A, Bi, i)- and k-(Ci A, Bi)-invariant subspaces are developed. They extend the (A, B)- and (C, A, B)-invariance respectively to decentralize systems. A geometric description of the maximal elements of the class of these subspaces that are candidates for generating a solution to various DDPDs considered are also developed. Numerical examples are given.

Remote Power Feeding of ISDN-Terminals at the Basic Access

Abstract: In this paper some principles of power feeding are discussed. For power supply of digital telphone sets the use of a DC/DC converter is a reasonable solution. With the implementation of the DC/DC converter into the terminal some problems must be solved like noise problems, decoupling problems and stabilized operation. A realization of a DC/DC converter is shown which has a good efficiency with loads from 10 mW to 1W. The converter can be used for the S -interface as well as for the U-interface in PABX applications.

Decoupling techniques applied to the design of a controller for an unregulated synchronous machine

Abstract: Decoupling techniques using state variable feedback are proposed for the design of a controller for a 2-input 2-output linear time-invariant multivariable model of an unregulated synchronous machine supplying power to an infinite grid, to accomplish single-input single-output decoupling and pole assignment, and thus enhance the dynamic (stability) characteristics of the resulting closed-loop system.

Light-activated thyristor

Abstract: A thyristor with simple and optimum decoupling of the optical triggering sensitivity from the triggering sensitivity due to interference currents is produced if, as decoupling means, a phototransistor is provided as switch in a connection between an auxiliary emitter to the base region near the main emitter in the semiconductor body which consists of at least four layer-type regions of alternating opposite conduction type each having a load current electrode in each of the two outer regions and a light-triggered auxiliary emitter in the base region forming a common surface with one outer region.

Further aspects of disturbance decoupling in decentralized linear systems

Abstract: This work extends disturbance decoupling to decentralized linear systems with direct control and disturbance feedthrough Necessary and sufficient conditions are given under which disturbance decoupling is possible by applying local state of measurement feedback laws combined with measured disturbance feedforwards Numerical examples are given

Nuclear magnetic resonance device also functioning as surface coil detection

Abstract: For measurements with increased accuracy in a nuclear magnetic resonance apparatus the detection device is provided with one or more surface coils (13) as measurement coils. To avoid mutual interference between a radio-frequency excitation coil (10) and a measurement coil, a measurement coil is provided with a decoupling circuit (36) with which the tuned circuit of which the coil (13) forms part is tuned to a significantly higher natural frequency during activation of the excitation coil (10). On the other hand the excitation coil (10) is shorted during detection with the surface coil (13) by a low-ohmic shorting circuit (72), thereby avoiding interference with the radio-frequency measurements signals.

Circuit for influencing the commutation in stepper motors

Abstract: not available for EP0044290Abstract of corresponding document: US4434392In a circuit arrangement for controlling the commutation of a stepping motor, each phase winding (1) of which is connected to the detector diagonal of a bridge circuit consisting of four switching transistors (2, 3, 4, 5), a capacitor (17) is connected across each phase winding (1) and a decoupling diode (13, 14) is included in each of two arms of the bridge circuit. In case of a bridge circuit comprising complementary transistors (2, 4; 3, 5), whose emitters are connected to the terminals (6, 7) of the supply voltage (Uo) and whose collectors are interconnected in pairs, the decoupling diodes (13, 14) are included in the collector leads of the transistors (2, 4) of one type of conductivity, and protective diodes (15, 16) are connected in parallel to the collector-emitter path of the transistors (3, 5) of the other type of conductivity.

Decoupling functionality to facilitate controlled growth

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Interaction effects in dilute magnetic alloys

Abstract: In this paper, the influence of interaction between magnetic impurity ions on the Kondo effect is treated by using Green's function method under the condition TTk (Kondo temperature). A self-consistent-field approximation for s-d exchange Hamil-tonian is adopted. Both of the two types of the decoupling terms, which are responsible for single-ion Kondo effect and inter-ionic interaction respectively, are retained. The Kondo temperature and the low-temperature resistivity for impurity system have been calculated. The results indicate that in dilute magnetic alloys interaction effects will decrease Tk and make the ρ-T curve in the region T Tk changes from 1-AT2 to 1 + BT2, with A,B 0. Thus a resistivity maximum may probably be observed in the temperature region T T_k.